Signs of Poor Mitochondrial Health

Mitochondria are the tiny power plants inside nearly every cell, turning the food you eat and the oxygen you breathe into usable energy. When they work less efficiently, the effects can show up as everyday tiredness, slower recovery, and less stamina — but those same feelings have many possible causes, so they are associations to understand, not a diagnosis to self-assign.

What mitochondria actually do

Each cell may hold hundreds to thousands of mitochondria, and they generate the bulk of the body's adenosine triphosphate (ATP) — the molecular currency that powers muscle contraction, nerve signaling, immune activity, and countless repair processes. Tissues that never rest, such as the heart, brain, and working muscles, are especially dense with mitochondria because their energy demand is so high. When mitochondrial output is robust, the systems that depend on it tend to feel effortless. When output becomes less efficient, the earliest changes are usually subtle and easy to attribute to a busy schedule or a poor night of sleep.

It helps to keep two ideas separate. First, there are rare, serious inherited mitochondrial diseases, which are medical conditions diagnosed and managed by physicians. Second, there is the gradual, everyday decline in mitochondrial efficiency that research associates with normal aging and certain lifestyle patterns. This guide is about the second category — the general, non-diagnostic signs that many people notice — and it is not a checklist for diagnosing any disease.

Common signs people associate with lower mitochondrial efficiency

Because ATP powers so many systems, reduced mitochondrial output tends to be felt first in the tissues that use the most energy. The signs below are frequently discussed in the aging and exercise-physiology literature as being associated with mitochondrial function. They are non-specific by nature: each one can be caused by dozens of unrelated factors, from thyroid issues to anemia to simple under-sleeping.

Persistent, disproportionate fatigue

Not the ordinary tiredness that a good night's sleep resolves, but a lingering sense that your baseline energy is lower than it used to be. Skeletal muscle depends heavily on mitochondria, and studies of aging muscle describe reduced mitochondrial density and efficiency as one contributor to why exertion can feel harder over time. Fatigue has an enormous list of possible causes, so it is best read as a prompt to look closer rather than proof of anything specific.

Reduced endurance and earlier fatigue during exertion

Feeling winded sooner on a walk, a climb, or a workout you used to handle comfortably. Endurance is closely tied to how efficiently muscles produce and sustain ATP, which is why mitochondrial capacity is a recurring theme in exercise research. In one human trial of urolithin A (Singh et al., 2022, Cell Reports Medicine), middle-aged adults saw improvements in measures of muscle strength and exercise performance — a signal that mitochondrial-supportive strategies and exercise capacity are linked, though this is not evidence that any supplement corrects a symptom.

Slower recovery after activity

Taking longer to feel like yourself after exercise, a demanding day, or illness. Recovery is an energy-intensive process, and several human studies of urolithin A have examined recovery-related and endurance markers — including a 2024 8-week randomized trial in resistance-trained men (Journal of the International Society of Sports Nutrition) that looked at endurance and recovery markers.

Mental fog and lower stamina for focus

The brain is metabolically expensive, so sustained concentration draws heavily on cellular energy. Many people describe a foggy, low-stamina feeling when their overall energy is depleted. Research into the brain and mitochondria is genuinely early and largely preclinical, so this connection should be held loosely.

A general drop in day-to-day resilience

Feeling that you bounce back more slowly, tolerate less, and run out of steam earlier in the day. This is the vaguest sign of all and overlaps with stress, sleep debt, and dozens of ordinary factors.

Why these signs are associations, not a diagnosis

Every symptom on this page is what clinicians call non-specific: it points in many directions at once. Persistent fatigue, for example, is one of the most common reasons people see a doctor, and the list of possible explanations includes iron deficiency, thyroid dysfunction, sleep apnea, depression, medication side effects, infections, and more — the overwhelming majority of which have nothing to do with mitochondria and many of which are highly treatable. There is no at-home test that reads out "mitochondrial health," and the specialized measurements used in research are not diagnostic tools for everyday tiredness. That is precisely why the responsible way to read these signs is as a nudge toward good habits and, when warranted, a proper medical evaluation — never as a self-diagnosis.

What genuinely supports mitochondrial health

The most established levers are unglamorous and well worth doing first, because their evidence base is far deeper than any supplement's.

Move — especially in ways that challenge your muscles

Exercise is the single most reliable stimulus for mitochondrial biogenesis, the process by which cells build new mitochondria. Both aerobic training and resistance training contribute, and consistency matters more than intensity. For most people, regular movement is the highest-yield thing they can do.

Sleep, protein, and whole foods

Quality sleep is when much cellular repair happens. Adequate protein supplies the raw materials for maintaining muscle. A diet rich in colorful plants supplies polyphenols and other compounds that research is actively exploring for their metabolic roles — our guide to foods for mitochondrial health goes deeper.

Where urolithin A fits

Urolithin A is a gut postbiotic — your microbiome makes it from ellagitannins found in pomegranates, walnuts, and certain berries. It has drawn scientific interest because it supports mitophagy, the cellular "recycling" process that clears out worn, underperforming mitochondria so healthier ones can take their place. In humans, urolithin A has been shown to be safe and well tolerated at up to 1,000 mg per day (Andreux et al., 2019, Nature Metabolism), to support muscle endurance in older adults over roughly four months (Liu and D'Amico et al., 2022, JAMA Network Open), and to support muscle strength and exercise performance in middle-aged adults (Singh et al., 2022). A 2025 randomized trial in Nature Aging reported support for immune-cell mitochondrial health in midlife adults. The foundational mitophagy and lifespan findings (Ryu et al., 2016, Nature Medicine) are preclinical — from worms and rodents — and should be read as mechanism, not human proof. A 2024 systematic review in Ageing Research Reviews fairly characterizes the human evidence as still emerging, from short trials with modest sample sizes.

To learn how the compound works end to end, start with our complete urolithin A guide, and if you are comparing products, see our roundup of the best urolithin A gummies. For the underlying cellular process, our explainer on what mitophagy is adds useful context.

Not a treatment — see your doctor. Urolithin A and the lifestyle strategies here are intended to support normal mitochondrial and muscle health. They are not a treatment for fatigue, weakness, or any medical condition. If your tiredness is new, worsening, or interfering with daily life — or comes with symptoms like shortness of breath, chest pain, unexplained weight change, or muscle weakness — please see a qualified healthcare provider to find the real cause.

The SOMA HEALTH approach

SOMA HEALTH Urolithin A Gummies deliver 1,000 mg per four-gummy daily serving — the top of the clinically studied 500–1,000 mg range. Each 30-day supply contains 120 raspberry-flavored, sugar-free gummies, and every batch is third-party tested. The goal is straightforward: a precise, well-characterized dose in a format that is easy to keep taking, so you can pair it with the movement, sleep, and nutrition that do the heavy lifting.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This guide is educational and is not a substitute for advice from a qualified healthcare provider.